Online Alarm Clock
Your latest online alarms
When you set and start an alarm, its settings (message, sound) for that time are saved automatically. Your saved alarms appear here. Click one to activate it with one click.
Free Online Alarm Clock
Set an alarm for any hour and minute with this free online alarm clock. It runs directly in your browser using your device's local time—no app or account required. Choose the time, optionally add a label and sound, then click Start alarm. When the time arrives the alarm rings and you can stop or snooze it. Use Test alarm to preview the sound. Keep the tab open until the alarm goes off. Use the toolbar to zoom or fullscreen. If the time has already passed today, the alarm rolls to tomorrow.
How to set an alarm online
Pick the hour and minute, then start the alarm. Keep the page open until it rings.
- Select the hour and minute for your alarm. The page shows a live clock and a preview of the selected time.
- Optionally use the Label and Sound rows on the widget to add a message and choose a ringtone.
- Click "Start alarm" to activate (or press Enter on the idle screen). The widget shows a countdown until the alarm goes off.
- Leave the page open so the alarm can play when the time arrives. You can stop or snooze when it sounds.
- Use the toolbar (top right) to zoom in or out or switch to fullscreen.
Use it to wake up, for a meeting or medication reminder, or to leave for work on time. Set alarm online for any time of day—no download. Open the page, set the time, and click Start alarm. Works on desktop and mobile.
Related time tools
Need a countdown? Try our Online Timer. Want to measure elapsed time? Use the Online Stopwatch. Need to count clicks or events? Try the Online Counter. Want to check the current time? See the Online Clock.
Frequently asked questions
- How do I set an alarm for a specific time?
Pick the hour and minute, optionally add a label and sound in the Label and Sound rows, then click "Start alarm" (or press Enter). The widget shows a countdown until it rings. Keep the tab open.
- Will the alarm work if I close the tab? Why didn't it go off?
It only runs while the page is open. Keep the tab active so it can sound. Closing the tab, putting the device to sleep, or (on PCs) sleep mode can stop it. On some phones, background or locked screen mutes sound—keep the page visible. Test before use and check volume.
- Can I set different sounds or messages for each alarm time?
Yes. Use the Label and Sound rows on the widget to add a message and choose a ringtone. Settings are saved when you start the alarm. Use "Test alarm" to preview the sound and snooze before starting.
- Can I use it on my phone?
Yes. It works in mobile browsers. Some phones mute sound when the browser is in the background or the screen is locked—keep the page visible or check device settings.
- Are my alarm settings saved? Can I bookmark an alarm?
Yes. Sound and message are saved per alarm time. Recently used alarms appear in "Saved alarms". Each alarm has its own URL—bookmark it and settings load with one click. You can also open a link with the time preset in the URL (e.g. #t=07-10).